Yellow paper document sent by Lowell Edwards to Albert Starr regarding the use of Teflon tubing on the dog heart valve. 1961 February 23 The M. Lowell Edwards Public History Project was made possible by a grant from the Edwards Lifesciences Fund. We are grateful to Teresa Edwards Allen and the extended family of M. Lowell Edwards for their generosity in sharing documents from the estate of M. Lowell Edwards. We also thank Richard J. Mullins, M.D. for his many contributions to this project.